The role of environmental factors on gene expression is illustrated by ____
a. the varying plant height of genetically identical yarrow plants when grown at different elevations
b. the flower color of hydrangeas
c. the coloration in snapdragon plants
d. male-pattern baldness
e. genetic variety in eye color
ANSWER: a
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A pine tree is a(n) ____, and a pine cone is a(n) ____
a. angiosperm; a seed b. haploid plant body; dipold plant body c. sporophyte; a gametophyte d. gametophye; a sporophye e. egg; pollen grain
The usual type of symbiotic relationship between humans and the bacteria normally found in their intestinal tract is that of
A. predator/prey. B. parasitism. C. mutualism. D. communism.
How are the four types of nitrogen-containing bases in DNA held together in the double helix of DNA?
What will be an ideal response?
Which of the following organelles does NOT contain its own DNA?
A. Nucleus B. Chloroplast C. Rough endoplasmic reticulum D. Mitochondrion